Remote-control apparatus



April 21, 1931.

J. M. PELIKAN REMOTE CONTROL APPARATUS Original'Filec1- Jan. 2Sheets-Sheet 2 M ATTORNEY l T E s'rATEs PATENT; OFF! JOHN M. PELIKAN, orPITTSBUR H,'rENNsYLvANLA; ASSIGNOR TO THE UNIoN swrrcn- A & SIGNALcoi/rrANY, or swIssvALE, PENNSYLVANIA, A CORPORATION or PENNe SYLVANIA rREMOTE-CONTROL ArrARA'ros Application filed January 31, 1929, SerialNb.336,427. Renewed September 26', 1930.

My invention relates to remote control apparatus, and particularly toapparatus for safety controlling traffic governlng'devices, such asrailway switches, from a distant point.

One feature of my nvention 1s the provision of means for controlling bycurrent of a given character supplied to one pair of conductors, aswitch and associated signals, a switch indication, and three trackcircuit indications.

I will describe one form'of'apparatus embodying my invention,'and willthen point out the novel features thereof in claims.

The accompanying drawings, Figs. 1 and 2, when placed side byside, withFig. 1 on the' left, constitute a diagrammatic view showing one form ofapparatus embodying my in- Vention.

Referring to the drawings, the reference character X designates astretch of main railway track connected with a siding Y by a switch F.The rails land 1a of stretch X are divided by insulated rail joints 2into track sections A -B, B C, and CD; Each of the sections AB, B@ andCD is provided with a track circuit which is supplied with current by abattery 3 connected across the rails adjacent one end of thesection, and1 with a track relay' G3, G2 or G1, respectively, connected across therails adjacent the oppo-' site end of the section. Sections AVB and CDare known as approach sections, and their circuits are known as approachtrack circuits. Section B-C is known asa detector section, and itscircuit is known as a de tector track circuit.

Slow releasing track circuit repeater relays g1 and 93 are controlled byfront contacts of track relays G1 and G3 respectively. An approachindication relay T is controlled by one circuit passing through a backcontact of relay G1 in series with a front contact of relay g1, and by asecond circuit passing through a back contact of relay G8 in series witha front contact of relay g3.

Signals S1, S2, S3 and S4 govern the movement of traffic over switch Fwhich inits normal position directs trafic moves over 7 stretch X only,and which in its reverse posiback contact of relay P.

tion directs moves over stretch X to or frombut such controls, formingno part of my Q invention, are omitted from vthe drawings.

Switch F, as here shown, is operated by a motor M comprising an armature5 and a' field winding 6, WlllCh is controlled in the normal directionby a slow releasing relay A hi and in the reversedirection b a slowreleasing'relay k2. Relayhl is intu'rn controlled by a front neutral anda normal polar contact of a slow releasing polarized relay H, and relayb2 is controlled by a front neutral and a reverse polar contact of relayH. A circuit controller designated by the reference character a isoperated in conjunction with switch'F. Circuit controller a is pro Videdwith a contact 131 which connects with a segment" 131a at all timesexcept while switch Flis in its reverse position, and which connectswith'a segment 1816 at all times except while switch F is in its normalposition. Circuit controller a is also provided with a contact 32 which,while switch F is in itsnor-' mal position, is in contact with aterminal 32a, and while switch F is in itsreverse posi tion, is incontact with a terminal 32?).

A polarized switch indicationrelay K' is controlled in the normaldirection by switch F in its normal position, and in the reversedirection by switch F inits reverse position. A slow pick-up relay '1?is controlled by a front neutral contact of relay 'K. Asecond switchindication relay I is controlled by a front contact of relay Kin serieswith a Switch control relay His controlledover a pairof conductors and64 by a lever V which may be included in a groupwith other similarlevers in a control station such as a train despatchersoflice. Lever Vhas a normalposition N, and a reverse position to the left designated bythe reference character L, and a reverse position to the rightdesignated by the reference character R. To energize relay H inthe'normal direction, lever V is operated to its L position, and toenergize relay H in the reverse direction, lever V is operated to its Rposition. Lever V is provided with seven contacts, 119, 52, 117, 49,150, 172 and 83. Contacts 117, 119 and 150 are closed while lever V isin its R position only, contacts 49, 52 and 172 are closed while lever Vis in its L position only, and contact 83 is closed while lever V is inits N position only.

Associated with lever V in the control staiion, are an approachindication relay E1, a detector circuit and switch indication relay E2,and a switch indication relay E3. Relay E3 is of a polarized type whichwhen de-energized retains its contacts in the closed positioncorresponding with that controlled by the last previous direction ofenergize.- tion of the relay. Contact 153 of relay E3 connects withterminal 153a when relay E3 is energized by current flowing throughcontact 172 of lever V, and since, with switch F in its normal position,lever V has been operated to its L position nest preceding its operationto its N position, contact 153 continues connected with terminal 153while lever V is in its N position. Approach and detector circuitindication apparatus and switch indication apparatus are designated bythe reference character (2 with distinguishing suflixes, and as hereshown are electric lamps. The approach indication lamps cg1 and eg3 arecontrolled by relay E1, detector circuit indication lamp eg2 isconirolled by relay E2, and switch indication lamps cfl and ef2 arecontrolled by relay E3.

Current is supplied to conductors and 64 and to the indication lamps bybatteries Q1 and Q2 which are located adjacent lever V. Conductors 55and 64 are also at times supplied with current by batteries Q3 and Q4which are located adjacent switch F, and which also supply current forthe operation of switch F. Resistance units 4 and 7 are employed toprevent the possibility of short circuits being caused by thede-energization of relays G1 and G3 at approximately the same time.

Having thus described, in general, the arrangement and location of thevarious constituent parts comprising my invention, 1 will now proceed toexplain the operation of the apparatus.

As shown in the drawings, all parts are in their normal condition, thatis, lever V is in its N position, track sections A B, BC and C-D areunoccupied, switch F is in its normal position for moves over stretch Xonly, and signals S1, S2, S3 and S4 are indicating stop. Contact 153 ofrelay being connected with terminal 153a, normal switch indication lampef2 is lighted by a circuit passing from battery Q2, through wires 42,43 and 44, contact 153-153a, wire 45, filament of lamp ef2, and wires46, 47 and 48 back to battery Q2. lVith relay G1 energized, relay g1 isenergized by its circuit passing from terminal 13 of battery Q4, throughwires 14, 15 and 16, contact 17 of relay G1, wire 18, winding of relayg1, and wires 19, 20, 21, 22, and 23 to terminal 11 which is common tobatteries and Q4. With relay G3 energized, relay g3 is energized by asimilar circuit passing from terminal 13 of battery Q4, through wires14, 15 and 24, contact 25 of relay G3, wire 26-, windng of relay 93,wires 27,20, 21, 22 and 23 to terminal 11. Since switch F is in itsnormal position, relay K is energized. in the normal direction by acircuit passing from terminal 11, through wires 23, 22 and 28, windingof relay K, wire 29, contact 30 of relay T, wire 31, contact 3232a ofcircuit controller a, and wire 33 to battery Q3. \Vith relay Kenergized, relay P is also energized by a circuit passing from terminal11, through wires 23 and 34, winding of relay P, wire 35, contact 36 ofrelay K, and wires 37 and 38 to battery Q3.

I will assume that, with all parts thus in their normal condition, atrain approaching switch F from the west, that is, from the left, asshown in the drawin s, deenergizes relay G3. Relay T is then energizedin the reverse direction by a circuit passing from terminal 11, throughwires 23, 22, 21 and 174, winding of relay T, wires 175 and 176,resistance unit 7, contact 156 of relay 3 wire 157, contact 158 of relayG3, and wires 159, 37 and 38 to battery Q3. Even though the opening oftrack relay G3 opens at contact 26 the circuit for relay 93, the latterrelay does not release for a short interval of time because it is slowreleasing in character. Helay T, being thus energized, completes,through its contact a, a circuit through the winding of approachindication relay E1 in the control station, this circuit passing fromterminal 11, through wires 23, 22, 28 and 39, contact 885 of relay I,wires 87 and 86, contact of relay H, wires 84 and 64, contact 83 oflever V, wires 82 and 54, winding of relay El, wire 55, contact 56 ofrelay G2, wire 57, contact 58?) of relay I, wire 59, contact 60a ofrelay T, wires 81 and 114, contact 80 of relay H, wire 79, resistanceunit 4, wire 96, contact 97 of relay g3, wire 98, contact 99 of relayG3, and wire 100 to terminal 10 of battery Q3. Relay E1 is now energizedin its normal direction, and hence lamp 093 is lighted by a circuitpassing from battery Q2, through wires 42, 43, 44 and 89, contacts and91a of relay E1, wire 101, filament of lamp 693, and wires 102, 46, 47and 48 back to battery Q2. After the lapse of sutlicient time followingthe opening of the circuit of relay 93 by contact 25 of relay G3, relayg3 opens its contacts 97 and 156, thereby (lo-energizing relays E1 andT, respectively. Relay E1 then opens its contact 90, breaking thecircuit and extinguishing the light of lamp 693.

ibis

I will assume that with all parts again in their normal condition, aspreviously described, a westbound train approaching switch Fde-energizes relay G1.: Relay G1,

by closing itsback contact'103, causes the en ergization of relay T inthe normal direction by a circuit passing from terminal 13 of batteryQ4, through wires 14, 15 and 16, contact 103 of relay G1, wire 104,contact 105 of relay gl, resistance unit 7, wire 175, winding ofrelay'T, and wires 174, 21, 22 and 23 to terminal 11. Relay T, throughits contact a,

now completes a circuit in the reverse direction through the winding ofrelay E1, this circuit passing from terminal 12 of battery 4, throughwire 74, contact 75 of relay G1, wire 76, contact 77 of relayg1,resistance unit 4, wires 78 and 79, contact 80 of relay H,-

wires 114 and.81, contact 60a of: relay T, wire 59, contact 586 of relayI, wire 57,-contact 56 of relay G2,wire 55, windingof relay E1, wires54and:82,rcontact 83 of lever V, wires64 and 84, contact 85 of relay H,wires 86 and 87, contact 886 of relay I, and wires 39,28, 22 and .23 toterminal 11. Re-

lay El, being energized'in its reverse direc tion, causes lamp 691 to belighted by a circuit passing from battery Q2, through wires 42, 43, 44and 89, contacts 90 and 91b of relay E1, wire 92, filament of lamp 691,and wires 93, 94, 95, 47 and 48 back to battery Q2. After the lapse ofsufucient time for relay 91 to open its front contacts following thede-energization of relay G1,. relay T again becomes de-energized, by theopening of contact" 105 of relay 91, causing relay E1 to becomede-energ'med and extinguish the light of lamp egl.

I will now assume that, with all parts i again in their. normalcondition, the dispatcher desires to permit a traincto move over switchF in its normal position He therefore operates lever V to its Lposition, completing a circuit in the normal direction through relay H,this circuit passing from battery Q2, through wire 42, contact49 0flever V, wire 50, winding of .relayE2, wire; 51, contact 52 of lever V,wires 53 and 54,"

winding of relay E1, wire 55, co-ntactj'56 of I relay G2, wire 57contact 58?) of relay 1,-

wiref59, contact 605 of relay T, wire 61,

winding of relay H, and wires 62, 64 and 65; back to battery Q2. RelayH,now"being en-- ergized in its normal direction, causes relay I 7L1 tobe energized by its circuit passing from terminalf13 of battery Q4,throughwires 66 and 67, contacts 68 and 69a, of relay H, wire 70,contact 71 of relay k2, wire 7 2, winding of relay 7L1, and wires 73 and23 to terminal 11. RelayE2, as well as relayH is operated by the circuittraced through the winding of relay H, closing the circuit of detectorindicator lamp 692 passing from battery Q2,

through wires 42 and 43, contact 143 of relay E2, wire 144, filament oflamp eg2, andwires 94,95, 47 and 48 back to battery Q2. WhilerelaysHandE2 are operated by the circuit through the windings of theserelays, the current flowing inthis circuit is not of sufficientmagnitude to operate relay E1. When the front and normal contacts ofrelay Hare closed While switch F is in its normal posi+.

tion, the arms of signals S2 and S3 are operated to the proceedposition. c

When an eastbound train approaches switch F whilelever V is in its Lposition, de-energizlng relay G3,.the reverse control circuit for relayT becomes closed by contact 158 of relay G3 as previously described. Re-

lay T being energized in itsreverse direction,

the circuit for relay His opened at contact 606 of relay T, and anapproach indication control circuit is closed, passing from battery Q2,through wire 42, contact 49 of lever V, wire 50, winding of relay E2,wire 51,

contact 52 of lever V, wires 53 and 54, Winding of relay-E1, wire 55,contact 56 of relay G2, wire57, contact 586 of relay 1, wire 59, contact60a of relay T, wire 81, contact 113 of relayT, wire 112, contact 111 ofrelayH,

wire 110, contact 1096 of relay T, wire 115, contact 116a of relay H,and wires64and 65 back to battery Q2. The current flowing in thiscircuit is of sufiicient magnitude to op-,

erate relay E1 as Well as relay E2, and hence lamp 693 becomes lightedby its circuit as previously traced. After the lapse of suflicienttime'following the de-energization of relay G3, relay 93 opensits-contact 156,

causing relay T to in turn-become de-energized. Relay E1, at" itscontact 90,-;then

opens the circuit of lamp e93, Relay H, lief ng of a slow releasingtype, .does not open. its front contacts/during the open period ofcontact 60b ofrelay T, when relay T is energizedas just described. 1

. If, with, all track sections again clear and with lever V in its Lposition, an approaching westbound train deenergizes relay G1,

relay T becomesenergized in its normal dircctionby its circuit passingthrough con tact 1031 of relay G1 as previously described. 1th relayTenergized in its normal direction, the circuit for. relay H is againopen at contact 605 of relay T, and a second approach indication circuitis closed, passing llO from terminal 13 of battery Q4, through wires 14,15 and 16, contact 103 of relay G1,

wire 104, contact 105. of relay g1, wire106, contact l07aof relay H,Wire 108,.contact 109a of relay T, wire 110, contact 111 of relay H,wire112, contact 113 of .relay T, wire 81, contact 60a of relay T, wire59, contact be noted that, in the circuit just traced, batteries Q3 andQ4 in series oppose battery The combined potentials of batteries Q3 andQ4 are suificiently in excess of the potential of battery Q2 to sendcurrent through this circuit in opposition to battery Q2 and ofsuflicient magnitude to operate relay E1 in the reverse direction. Lamp091 then becomes lighted for a brief 2 period by its circuit aspreviously described.

As a train approaching switch F proceeds into section BC, tie-energizingrelay G2, the main circuit which operates relays E2 and H is opened atcontact 56 of relay G2. Relay E2, upon becoming de-energized, opens thecircuit of lamp e92, extinguishing the light of this lamp and therebyshowing to the dispatcher that the detector section is occupied. Thede-energization of relay H causes the arms of signals S2 and S3 to bereturned to the stop position.

I will assume that, when all track sections are again unoccupied, thedispatcher desires to send a train from stretch X over switch F tosiding Y or in the reverse direction from sidin Y over switch F tostretch X. He there ore operates lever V to its R position, causingcurrent to be supplied to relay H in the reverse direction by a circuitpassing from batter Q1, through wires 48, 65, 64 and 62, win ing ofrelay H, wire 61, contact 606 of relay T, wire 59, contact 586 of relayI, wire 57, contact 56 of relay G2, wire 55, winding of relay E1, wires54 and 53, contact 117 of lever V, wire 50, winding of relay E2, wire118, contact 119 of lever V,and wire 120 back to battery Q1. The currentflowing in this circuit passes through relay E2 in the same direction asthe current in the circuit which is closed while lever V is in its Lposition, but in the reverse direction through relays Eland H. Relay E2is thus again energized in its normal irection, causing lamp 0312 tobecome lighted, and retaining its contact 147 in the open position. Thecurrent flowing in the circuit is of insufficient magni-' tude tooperate relay E1. Relay H, now being energized in its reverse direction,completes a circuit for relay 71.2 passing from terminal 13 of'batteryQ4, through wires 66 and 67, contacts 68 and 69b of relay H, wire 121,contact 122 of relay b1, wire 123, winding of re- In 11 2. and wires124, 73 and 23 to terminal'11.

With relay h2 energized, the reverse operating circuit for motor Mbecomes closed, passing from terminal 13 of battery Q4, through wires 66and 125, contact 126 of relay h2, wire 127, armature 5 of motor M, wire128, contact 129 of relay k2, wire 130, contact 131a-131 ofcircuitcontroller a, wire 132, field winding 6 of motor M, and wire133to battery Q3. Motor M now operates switch F to its reverse position,and opens contact -131-1.31a thereby deenergizing motor M.

During the operation of switch F from its normal to its reverseposition, the circuit for relay K through contact 3232a of circuitcontroller a is opened when the switch leaves its normal position, andthe reverse control circuit for relay K becomes closed through contact326-32 of circuit controller a upon the completion of the stroke ofswitch F. The reverse control circuit thus closed for relay K passesfrom terminal 13 of battery Q4, through wire 134, contact 32b-32 ofcircuit controller a, wire 31, contact 30 of relay T, wire 29, windingof relay K, and wires 28, 22 and 23 to terminal 11. Relay K is thusenergized in its reverse direction.

During the de-energization of relay K, relay P, being de-energized bythe o ening of contact 36 of relay K, has closed its liack contact 41.Upon the re-energization of relay K, a circuit becomes closed for relay1, passing from battery terminal 11, through wires 23, 22, 28 and 39,winding of relay 1, wire 40, contact 41 of relay P, wire 35, contact 36of relay K, and wires 37 and 38 to battery Q3. Relay P, having a slowpick-up, does not open its contact 41 until a short interval of time haselapsed after relay I has been energized. In the meantime, with thefront contacts of relay I closed, a switch indication circuit has beencompleted, passing from terminal 13 of battery Q4, through wires 14 and135, contacts 136?; and 137 of relay K, wire 138, contact 88a of relayI, wires 87 and 169, contact 1651) of relay T, wires 63, 64, 65 and 48,battery Q1, wire 120, contact 119 of lever V, wire 118, winding of relayE2, wire 50, contact 117 of lever V, wires 53 and 54, winding of relayE1, wire 55, contact 56 of relay G2, wire 57, contact 58a of relay 1,wire 139, contacts 140 and 141b of relay K, and wire 142 to terminal 9of battery Q3.

In the circuit just traced, the battery potential between terminals 9and 13 sends current inopposition to battery Q1 and of sufficientmagnitude to operate relay E2 in the reverse direction but not tooperate rela E1. With relay E2 operated in the reverse irection, thereverse operating circuit for relay E3 becomes closed, passing frombattery Q2, through wires 42, 43, 44 and 89, contact 145 of relay E1,wire 146, contacts 147 and 148 of relay E2, wire 149, contact 150 oflever V, wire 151, the right-hand terminal of the winding of relay E3,through the right-hand portion of the winding of relay E3, and wires152, 95, 47 and 48 back to battery Q2.

Relay E3 then closes contact 153-153b, causing lamp efl to be lighted bya circuit passing from battery Q2, through wires 42, 43 and 44, contact153-153b of relay E3, wire 154, filament of lamp cfl, and wires 95, 47and 48 back to battery Q2. After the lapse of a brief period of time,relay P opens its contact 41, thus de-energizing relay I which then, byits contact 586, again. completes the reverse circuit for relay H,causing relay E2 to again become energized in its normal direction andopen its contact 147 de-energizing relay E3 which, however, as alreadystated, does not open its contacts when it is de-energized. Lamp efltherefore. continues lighted.

When switch F has been operated to its reverse position and while thefront andreverse contacts of relay H are closed, the arms of signals S1and S4 are operated to their proceed position. i

It now an approaching westbound train de-energizes relay G1, another.approach in,- dication circuit is completed by relay T which becomesenergized in its normal direction as previously described. The approachindication circuit which is now closedpasses frombattery Q1, throughwires 48, 65, and

64, contact 1076 of relay H, wire 108, contact 109a of relay T, wire110, contact 111 of relay H, wire 112, contact 113 of relay T, wire81,'contact a of relay T, wire 59, contact 586 of relay 1, wire 57,contact 56' of relay G2, wire '55, winding of relay E1, wires 54 and 53,contact 117 of lever V, wire 50, winding of relay E2, wire 118,.contact119 of lever V, and wire .120 back to battery Q1. With relay H nowremoved from the circuit, battery Q1 supplies sufficient current to0perate relay E1 in its reverse direction as well as relay E2in itsnormal direction. Lamp cgl therefore becomes lighted for a brief periodas previously described.

When all the track sections are again unoccupied while lever V is in itsR position, an eastbound train de energizing relay G3 causes relay Tto'become energized in the reverse direction andto complete stillanother ap'-' proach indication circuit. This approach indicationcircuit passes from terminal 13 of battery Q4, through wires 66 and 125,con-- tact 170 of relay 62, wire 171, contacts 1666 and165a of relay T,wires 63, 64, and 48,

battery Q1, wire 120, contact=119 -ot lever V, wire 118, winding otrelayE2, wire 50, con tact 117 of lever V, wires 53 and 54,winding of relayE1, wire 55, contact 56 of relay G2,

wire 57, contact 586 of relay'I, wire'59, contact 60a of relay T, wire81, contact v113 of relay T, wire 112, contact 111 of relay H,wire 110,contact 1096 of relay T, wire 115, contact 1166 of relay H, wire 155,vcontact 1560f relay g3, wire 157, contact 1580f relayG3, and wires 159,37 and 38 to battery Q3. .Batteries Q3 and Q4now supplysufiicientcurrent through this circuit in opposition to battery Q1 to operaterelay E1 in the normal direction as well as relay E2 in the reversedirection; Lamp eg3 thereupon becomes lighted for a brief period aspreviously described.

If, when all the track sectionsare again unoccupied the dispatcherdesires to return switch a its normal-positiomfhe returns lever V to itsL position thus again closing the normal control circuit for relay H andcausing the armsof signals S1 and S4 to be returned to the stopposition. Relay H, uponbeing energized in its normal direction,causesrelay 7L1 to .become energized by its circuit previously traced.Relay 61, upon becoming energized, completes the normal operatingcircuit for motor M, passing from terminal 13 of battery Q4, throughcontact 160 of relay 6 1,.wire 161, armature 5 of motor M, wire 162,contact 163 of relay 61, wire 164, contact 1316131 of circuit controllera, wire 132, field winding 6 of motor M, and wire 133 to battery Q3.Motor M then returns switch F to its normal position. Upon completion ofthis operation of switch F, contact 1316-131 is opened, breaking themotor circuit. Y

During the operation of switch F from its reverse to itsnormal position,the reverse control circuit forrelay K is opened at contact 326-32015circuit controller a when the switch leaves itsreverse position, and thenormal control circuit previously traced for relay K becomes closedthrough contact 3232a-of circuit controller a upon the completion oftheoperation of switch F. Upon the re-energ'ization of relay K in itsnormal direction, relay I becomes energized: by its circuit aspreviously traced. Upon the energization of relay I when switch F isreturned to its normal position, a switch indication circuit becomesclosed, passing from terminal 13 of batteryQ4, through wires 14 and 135,contacts 141a and 140 of relay K, wire 139, contact 58a of relay I,,wire 57, contact 56 of relay G2, wire 55, winding of relay E1, wires 54and 53, contact 52 of lever V, wire 51, winding of relay E2, wire 50,contact 49 of lever V, wire 42, battery Q2, wires 65, 64 and 63,contact1656 of relay T, wires 169 and 87, contact '88aof'relay 1, wire138, contacts 137 and 136a'of relay K, and wire 142 to terminal 9ofbattery Q3. By-meansof this circuit,.the potential between batteryterminals 9 and 13 sends 'currentin opposition to battery Q2 and ofsuflicient magnitude to operate relay E2 in its reverse direction, butnot of sufiicient magnitude to operate relay E1. RelayoE2 thereuponcloses its contact 147, completing a circuit through the left-handportion of the winding of relay E3, this circuit passingTfrom batteryQ2, through wires 42, 43,44 and 89, contact 145 of relay E1, wire 146,contacts 147 and148'of relay E2, wire 149, contact 172 of lever V, wire173,

left-hand terminal of the winding of relay W I claim is:

scribed only one form of remote control a'pparatus embodying myinvention, it is understood that various changes and modifi-- cationsmay be made therein within the scope of the appended claims withoutdeparting from the spirit and'scope of my invention.

Having thus described my invention, what 1. In combination, a railwaytraflic governing device, a first and a second and a third section ofrailway track, a track circuit for each of said sections each includinga track relay, a pair of conductors, means for supplying current of agiven character to said conductors at a first voltage for controllingsaid traliic governing device, an indication means, means controlled bysaid trafiic govm'mg device for supplying current of said givencharacter to said conductors at a secand voltage for controlling saidindication means, a second and a third and a fourth indication means,and means controlled by said first and second and third track relays forsupplying current of said given character to sea conductors forcontrolling said'second and third and fourth indication means respectively.

2. In combination, a railway traffic govorni'ng device, a first and asecond and a third section of railway track, a track circuit for each ofsaid sections each including a track relay, a pair of conductors, meansfor sup? plying current of a given character and of normalpol'arity tosaid conductors for con trolling said trarliic governing device, aninmeans, means controlled by said traflic governing device for supplyingcurrent of said given character but of reverse polarity to"saidconductors for controlling said indication means, a second and a thirdindication means, means controlled by said first and second track relaysfor supplying said conductors with current of said given character butof greater magnitudethan the current which controls said traflicgovernimg device and said first indication'means, means including saidcurrent of greater m1 itude' for' controlling said second or sai thirdindication means according as said current is of normal or; reversepolarity respectively, a fourth indication means, and means controlledby said third track relay for supplying current of said given charactento said conductors for controlling said fourth indication means.

3. In combination, a railway switch, a pol'arized switch indicationrelay energized in itsnormml' or its reverse direction according as saidswitch is in its'normal or its reverse tion respectively, a secondindication reay controlled by a neutral front contact of said olarizedindication relay, a third indication relay controlled by aback contactof said second indication relay and by a neutral front contact of sai pa sed indication relay, a polarized switch control relay, a polarizedfourth indication relay, a first and a second conductor, a manuallyoperable lever having a normal and a reverse position, a circuitincluding the winding of said switch' fourth indication relay while saidlever is in either its normal or its reverse position but causing saidcurrent to flow through said circuit in a normal or a reverse directionaccording as said lever is in its normal or its reverse position, abranch path'around said control relay and said third indication relayback contact in said circuit including a front contact of said thirdindication relay and a front contact of said first indication relay,means including a second source and controlled by polar contacts of saidfirst indication relay for supplying said circuit through said'branchpath with currentof reverse or normal polarity according as said polarcontacts are closed in their normal or raverse positions respectively,the potential of said second source being great enough to send currentof suflicient'magnitude in opposition to the potential of said firstsource to cause said fourth indication reiay to close its polar contactsin their reverse position, means for controlling the operation of saidswitch by said control relay, and indication means controlled by saidfourth indication relay.

f. In combination with a railway switch, a first and a' second sectionof railway track, a track circuitforeach of said sections each includinga track relay, a first slow releasing repeater relay controlled by afront contact of said first track relay, a second slow releasingrepeater relay controlled by a front contact ofsaid second track relay,a first polarized indication relay controlled by current of normalpolarity flowing in a circuit including 7 f a back contact of said firsttrack relay and a front contact of said first repeater relay and bycurrent of reverse polarity flowing in a circuit including a backcontactof said second track relay and a front contact of said second repeaterrelay, a polarized switch control relay, a first and a second conductor,a second polarized indication relay, a manually operable lever' having anormal position and a first and asecond reverse position, a circuit 7including the winding of said control relay and a neutral back contactof said first polarized indication relay as well as said first andsecond conductors and the winding of said second indication relay inseries, means 10? ond track relay, means for supplying said insupplyingsaid circuit with current of normal or reverse polarity according assaid lever is operated to its first or its second reverse position,respectively, said current being of sufficient magnitude to operate saidswitch control relay but not said second indication relay, an indicationcircuit including a front contact of said first indication relay and aback contact of said control relay as well as a front contact ofsaidfirst repeater relay and a back contact of said first track relayand also said first and second conductors and the winding of said secondindication relay in series and a contact closed while said lever is inits normal position, means for supplying said indication circuit withcurrent of normal polarity to operate said second indication relay inits normal direction, a branch path around said contacts of saidfirsttrack relay and said first repeater relay in said circuit includinga front contact of said second repeater relay and a back contact, ofsaid secdication circuit through said branch path with current ofreverse polarity to operate said second indication relay in its reversedirection, means for controlling the operation of said switch by saidswitch control relay, and indication means controlled by said secondindication relay.

5. In combination with a railway switch, a first and a second section ofrailway track, a track circuit for each of said sections each includinga track relay, a first slow releasing repeater relay controlled by afront contact of said first track relay, a second slow releasingrepeater relay controlled by a front contact of said second track relay,a first polarized indication relay controlled by current of normalpolarity flowing in a circuit including a back contact of said firsttrack relay and a front contact of said first repeater relay and bycurrent of reverse polarity flow ing in a circuit including a backcontact of said second track relay and a front contact of said secondrepeater relay, a polarized switch control relay, a first and a secondconductor, a second polarized indication relay, a manually operablelever having a first and a second position, a circuit including thewinding of said control relay and a neutral back contact of said firstpolarized indication relay as well as said first and second conductorsand the winding of said second indica tion relay in series, means forsupplying said circuit with current of normal or reverse polarityaccording as said lever is in its first or its second positionrespectively, said current being of sufiicient magnitude to operate saidswitch control relay but not said second indication relay, around saidcontrol relay winding and said first indication relay back contact insaid circuit a branch path includ ing a front and a normal contactof'said first indication relay and a front and a normal contact of saidcontrol relay as well as a front contact of said first repeater relayand a back contact of said first track relay, means for supplying saidcircuit through said branch path with current of reverse polarity and ofsufficient magnitude to oper ate said second indication relay in itsreverse direction, in multiple with said first'branch path, a secondbranch path including a front and a reverse contact of said firstindication relay and a front and a normal contact of said control relay,means for supplying said circuit through said second branch path withcurrent of normal polarity and of sufficient magnitude to operate saidsecond indication relay in its normal direction, in multiple with saidfirst branch path, a third branch path including a front and a normalcontact of said first indication relay and a front and a reverse contactof said control relay, means for supplying said circuit through saidthird branch path with current of reverse polarity and of sufficientmagnitude to operate said second indication relay in its reversedirection, in multiple with said first branch path, a fourth branch pathincluding a front and a reverse contact of said first indication relayand a front and a reverse contact of said control relay and also a frontcontact of said second repeater relay and a back contact of said secondtrack relay, means for supplying said circuit through said fourth branchpath with current of normal polarity and of sufficient magnitude tooperate said second indication relay in its normal direction, means forcontrollingthe operation of said switch by said control relay, andindication means controlled by said second indication relay.

In testimony whereof I afiix my signature.

JOHN M. PELIKAN.

